treatment of refractory ores

Treatment of Refractory Gold Ores

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified there are a number of alternatives for treating the ore Firstly the gold can be made more amenable to cyanidation by ultra fine milling followed by a hot atmospheric…

PDF Treatment of pyritic matrix gold–silver refractory

Treatment of pyritic matrix gold–silver refractory ores by ozonization–cyanidation…

Refractory Gold Mining SGS

SGS has developed a series of testing and mineralogy assessment protocols that allow us to determine the character of refractory gold and the mass balance between refractory and free milling gold Once the deportment or textural associations of the gold is determined and the mass balance known flowsheet options are developed …

Microbial consortium treatment of refractory precious

nbsp 0183 32 The consortium treatment facilitates gold recovery by either blocking or modifying the gold adsorbing carbon of the refractory ore Example 3 A sulfidic carbonaceous gold ore containing 0 9 ounce gold per ton from the Newmont Gold Mining Company s Post ore deposit was treated in accordance with the invention …

Treatment of carbonaceous refractory gold ores

Carbonaceous refractory gold ores 1049 For many years roasting was the traditional method for treating refractory gold ores Thus at the early stages of evaluating different processes for treating Carlin gold ores a number of roasting tests were carried out on the ores …

US4923510A

Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation the particular steps in the treatment of the …

Ozone Science amp Engineering Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores

leachable ores are forcing the mineral industry to explore new options to treat the refractory gold and silver ores Since ozone is a strong oxidant it may be regarded as a promising alternative in the treatment of refractory ores Some research work has been…

John T Boyd Company – Refractory Ore Specialist Consultant

During the period from 1994 to 2009 the percentage of world gold production from refractory gold ores increased from 5 to over 10 Examples of Refractory Ore treatment include Pressure oxidation of flotation concentrates Pressure oxidation of whole ore Tank biooxidation of flotation concentrates BOYD staff have nbsp…

PDF Recent advances in the treatment of refractory

PDF On John Monhemius and others published Recent advances in the treatment of refractory gold ores Find read and cite all the research you need on ResearchGate The introduction …

Treatment of Refractory Gold Ores SpringerLink

The treatment of refractory gold ores containing carbonaceous material and sulfides In Gold and Silver Leaching Recovery and Economics edited by W J Schlitt W C Larson and J B Hiskey New York SME AIME 17–22 …

Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding 1 Arsenic bearing refractory gold ore has stones extremely difficult to deal with In the stones gold is locked up in arsenic …

Gold recovery from a refractory pyrrhotite ore

The choice of process for refractory ores or concentrate treatment is based on many technical economic and environmental factors There are several ways for effective oxidative destruction of the sulphide matrix oxidation roasting aqueous pressure oxidation bacterial oxidation and chemical oxidation Lawrence 1990 McNulty and Thompson 1990 Veglio et al 1993b Ubaldini et al 1994 …

Treatment of carbonaceous refractory gold ores ResearchGate

Dec 19 2017 Download citation Treatment of carbona Gold ores can be egorized into two types free milling and refractory Free milling ores are those easy to process by simple gravity techniques or direct cyanidation Refractory ores on the other hand are difficult to treat and require precyan…

download the PDF University of British Columbia

From this survey of treatments are derived diagnostic conditions that may be useful in predicting the specific refractory characteristics of many ores Conventional processes are surveyed and include the refractory ore treatments that enjoy commercial appliion Oxidative pretreatments lixiviants for gold dissolution and nbsp…

280 RECENT ADVANCES IN THE TREATMENT OF REFRACTORY GOLO ORES

281 Recent advances ln the treatment of refractory gold ores A J Monhemius Department of Mineral Resources Engineering Royal School of Mines Imperial College of Science and Technology London SW7 2BP United Kingdom 1 INTRODUCTION The past…

Carbon in chlorine Treatment of Refractory Gold Ores

The U S Bureau of Mines is investigating the treatment of refractory gold ores Chlorination in the treatment of refractory gold ores is applicable in many low grade gold operations When usable this treatment provides an economic means of consuming sulfides …

US4902345A

The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation leaching …

ALBION PROCESS FOR TREATMENT OF REFRACTORY ORES

Albion Process Overview 4 Combination of Fine Grinding and Atmospheric Oxidative Leaching to breakdown sulphide minerals e g pyrite to make refractory gold available for cyanide leaching Stirred Mills Feed P 80 75 181 m Product P 80 12 181 m Atmospheric…

The Leachox™ Refractory Gold Process – The Testing Design

treatment of traditionally difficult to process refractory gold ores he process offers a low T capital and operating cost route but with similar high gold recoveries to bio oxidation INTRODUCTION The Problem of Refractory Ores Refractory gold ores are…

Refractory gold ores in Archaean greenstones Western CiteSeerX

Mesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite Ф arsenopyrite Ф pyrrhotite sulphide assemblage Many of these ores are refractory to varying degrees and require treatment by roasting bacterial oxidation or finer milling The most common sulphide ore types can be nbsp…

Pretreatment Process on Refractory Gold Ores with As JStage

The basic principle characteristics and appliion of pretreatment technique of arsenicbearing gold ores are presented in this paper Several different classes of process options for pretreating refractory ores are considered These options include roasting oxidation wet chemical treatment bacterial peroxidation and nbsp…

Alkaline Oxidative Leaching of GoldBearing Arsenopyrite Ores

Sep 5 1989 their possible appliions to treat refractory gold ores 5 These processes can be classified as pressure oxidation 6 biological oxidation 7 and chemical oxidation 8 Emerging pressure oxidation processes that can be used to treat goldbearing arsenopyrite include a calcium chlorideoxygen nbsp…

Supercritical Water Treatment of Refractory Gold Ores

Developing a single simple treatment that will handle both pyritic and carbonaceous types of refractory gold ores remains an enticing goal supercritical solvent extraction may provide a …

Recovery Refractory Resources

As a result refractory ores require physical or chemical pre treatment for adequate gold recovery to be achieved through traditional cyanidation and carbon adsorption processes Pyrite and arsenopyrite are the most common host minerals in refractory goldcal pre…

Treatment of Oxidized Copper Ores with Emphasis on Refractory Ores

Treatment of Oxidized Copper Ores with Emphasis on Refractory Ores TONG DENG and JIAYONG CHEN Institute of Chemical Metallurgy Academia Sinics Beijing 100080 PRChina Received July 5 1990 Received in final form August 13 1990 Oxidized copper ores are exhibiting increasingly their importance as nbsp…

Ultra Fine Grinding

Ultra Fine Grinding A Practical Alternative to Oxidative Treatment of Refractory Gold Ores S Ellis Kalgoorlie Consolidated Gold Mines Kalgoorlie WA Abstract Since early 2001 Kalgoorlie Consolidated Gold Mines KCGM has successfully operated an ultra fine…

Refractory goldbearing ores a review of treatment methods and

The problem of the refractory nature of goldbearing sulphide ores is described and possible pretreatments are reviewed Among them bioleaching is an interesting one from an environmental point of view but up to the present the process has been too slow The IBES Indirect Bioleaching with Effect Separation process nbsp…

Treatment Status for Refractory Gold Ores Precious Metals

The directly cyanide leaching rate of refractory gold ores is very low Certain methods for processing must be taken to increase the recovery rate The reason of low leaching rate of refractory gold ores was briefly analyzed and several common research methods and …

Processing of Konkola copper concen

Processing of Konkola copper concen trates and Chingola refractory ore in a fully integrated hydrometallurgical pilot plant circuit this route for treatment of copper gold ores in particular has been recognised3 The process has still to be applied on a …

PDF Cyanidation of Refractory Gold Ores A Review

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide leaching circuits even when the ore is finely ground The degree of refractoriness has been …

MICROBIAL PRE TREATMENT OF DOUBLE REFRACTORY GOLD ORES

In this study microbial pre treatment of double refractory gold ore sample A and concentrate sample B was investigated using a white rot fungus Tramestes versicolor A Pulp density temperature pH and retention times were the process variables…

Treatment of refractory carbonaceous sulfide ores for

nbsp 0183 32 Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation the particular steps in the treatment of the …

FungalTransformation of Surrogate Sulphides and AJOL

interest in research on gold recovery from refractory ores These hardtotreat ores occur in several gold mining regions throughout the world and production of gold from refractory ores continues to increase with time Baako 1972 Boyle 1979 Kesse 1985 Brierley 1995 Vaughan and Kyin 2004 In refractory ores gold nbsp…

Recovery Refractory Resources SGS

Sep 1 2012 and arsenopyrite are the most common host minerals in refractory gold deposits Recent introduction of hydrometallurgi cal pretreatment processes such as pressure oxidation and bacterial leaching biooxidation has given mining companies more options for treating refractory ores says Dr Fleming …

US Patent for Treatment of refractory carbonaceous and

Treatment of refractory carbonaceous and sulfidic ores or concentrates for precious metal recovery Newmont Gold Co The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation leaching …

Gold extraction Wikipedia

A quotrefractory quot gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes These refractory ores require pretreatment in order for cyanidation to be effective in recovery of the nbsp…

Pretreatment of a refractory gold sulfide ore by means of

Pretreatment of a refractory gold sulfide ore by means of acidithiobacilli cells P Chiacchiarini V de la Fuente and E Donati Facultad de Ingeniería Universidad Nacional del Comahue Buenos Aires 1400 8300 Neuquén Argentina patchia uncoma edu ar Centro de Investigación y Desarrollo de Fermentaciones nbsp…

economics of refractory gold ore processes ACP Equipment

Refractory gold ore pretreatment processes continue to receive much attention This paper compares the relative economics of treating ores by oxygen pressure oxidation roasting and bacterial oxidation with or without preconcentration by froth flotation Capital and operating cost estimates for each method of pretreatment nbsp…

Leachox™ Refractory and Sulphide Gold Process Maelgwyn

MMS has successfully developed the Leachox™ Process for the treatment of sulphide gold ores The Leachox process flowsheet can be designed to treat refractory or double refractory ores that contain preg robbers It can also be used to treat standard non refractory flotation and gravity concentrates in a more cost nbsp…

recovery of gold from refractory ores zimbabwe

of silver from the refractory silver ore tailings essentially on refractory ores of gold rather than recovery of the contained silver from the tailings pre treatment of refractory gold concentrates from the Roasting is the only commercialised process in Zimbabwe for …

Treatment of Refractory Gold Ores SpringerLink

Abstract Problem ores that yield low say less than 80 gold recovery by cyanidation when normally ground are defined as refractory The term as well as the technical methods used to treat such ores are relatively new Rose and Newman 39s very comprehensive book The Metallurgy of Gold does not even contain the nbsp…

v117n8a4 Evaluation of ozonation technology for gold recovery and cyanide management during processing of a double refractory

developed for the treatment of refractory double refractory gold ores In order to overcome refractoriness associated with sulphides the partial or complete destruction of sulphides and sometimes carbon via chemical or biological processes pressure oxidation or…

Treatment of carbonaceous refractory gold ores

In addition the paper describes the various pre cyanidation treatment methods for carbonaceous refractory gold ores namely 1 flotation and depression 2 blanking 3 the use of activated carbon or resin in leach 4 roasting 5 chemical oxidation and 6…

Refractory Gold Ore Treatment Methods 911 Metallurgist

Jan 11 2018 Where gold is associated with arsenic antimony tellurium and certain other minerals it is often only partly soluble in cyanide solution The difficulty is usually more of a physical than a chemical one but special methods of treatment may be required …

treatment refractory copper ores

Treatment of Refractory Gold Ores Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified there are a number of alternatives for treating the ore Firstly the gold can …

Application of the Albion Process for the treatment of refractory ores

Application of the Albion Process for the treatment of refractory ores Albion Process Lunch 28th August 2018 2 Outline 1 Albion Process technology 2 The GPM Project 3 Performance of the Albion Process at GPM 4 Review of global installations Albion …

Processing of Konkola copper concen trates and Chingola SAIMM

trates and Chingola refractory ore in a fully integrated hydrometallurgical pilot plant circuit by R M Whyte N Schoeman† and K G Bowes‡ Synopsis The Konkola Deep Mining Project KDMP seeks to exploit the deep level potential of the Konkola Deeps orebody producing high grade copper concentrates for treatment nbsp…

 

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